At low altitudes the altitude of a parachutist and time in the air are linearly related. A jump at 1,980 feet lasts 90 seconds. (A) Find a linear model relating altitude a (in feet) and time in the air t (in seconds). (B) Find the rate of change of the parachutist in the air. (C) Find the speed of the parachutist at landing. (A) Find a linear model relating altitude a (in feet) and time in the air t (in seconds). a = (Type an equation using t as the variable.)

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